Motor driven pump mounting



1941- R. s. WYNE MOTOR DRIVEN PUMP MOUNTING Filed July '7, 1938 2 Sheets-Sheet l fiober 5. W e. BY

I ATTORNEY Aug. 26, 1941. RSWYNE 2,253,597

MOTOR DRIVEN PUMP MOUNTING Filed July 7, 1938 2 Sheets-Sheet 2 way-3. W

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ATTORNEY Patented Aug. 26 1941 UNITED STATES" PATENT OFFlCE" I 2,253,597 MOTOR nnrvnn PUMP MOUNTING Robert S. Wyne, Kansas City, Mo. Application July 7, 1938, Serial'No. 217,914

Claims.

This invention relates to motor driven pump mountings and more particularly to a pump mounting for a motor driven pump adapted for actuating the elevating systems of dental and like chairs.

The principal object of the present invention chairs as a standard or base housing for an improved elevating system actuating mechanism;

to provide an improved mounting for a pump and motor therefor; to provide an eflicient, durable and easily installed pump and motor for elevating the chair; to provide a motor driven pump assembly requiring a minimum of additional parts to change a foot pump actuated chair to a motor actuated chair; to provide improvements in the connecting and mounting elements for a pump and motor therefor; to provide an improved arrangement of those elements; and to provide a motor driven pump mounting capable of effecting economies to users of motor driven pump elevating systems of this character. 7

In accomplishing these and other objects of the present invention, I have provided improved details of structure, the preferred form of which is illustrated in the accompanying drawings,

wherein:

Fig. 1 is a perspective view of the pedestal and jack of a dental or like chair equipped; with a motor driven pump and mountingtherefor constructed and mounted in accordance with the present invention.

Fig. 2 is a front elevational view of the apparatus illustrated in Fig. 1, parts of the mounting and pedestal being cut away to particularly i1- lustrate the construction and arrangement'of the elements entering into the organized apparatus.

Fig. 3 is a side elevational view of the apparatus illustrated in Figs. 1 and 2, taken at right angles to the showing of Fig. 2, and particularly illustrating the connections between the pressure medium sump and jack elevating piston.

Fig. 4 is a detail perspective view of a pump and portions of a motor mounting arranged in accordance with the present invention, said pump and portions being shown in disassembled relation.

Fig. 5 is a detail perspective view of the motor mounting sleeve and pump connections, the same being shown in disassembled spaced relation.

Referring more in detail to the drawings:

I designates a pedestal for a conventional dental or like chair, a jack 2 being reciprocably mounted within the interior 3, Fig. 3, of the pedestal. The pedestal is provided with a sump 4 for receiving pressure medium such as oil 5 adapted for hydraulically actuating the jack 2.

The usual lifting device 6 is suitably connected with the jack 2 and communicates with a substantially conventional hydraulic system I which preferably includes the usual piston cylinder 8 communicating through a conduit 9 with an air bell l0. A relief valve II is also provided in the hydraulic system i which is suitably connected with a pedally actuated release member [2, Fig. 1, mounted on the pedestal in convenient position for actuation by an operator. The usual intake member 13, Fig. 3, is also provided for conveying the pressure medium 5 from the sump to the pump for elevating the jack as now to be described.

As was previously pointed out, one of the principal objects of the present invention is to'provide a conventional dental chair, normally provided with a foot pedal actuated pump for elevating the lifting jack, with a motor driven pump, in such a manner that conversion of the pedally actuated elevating mechanism to a motor driven pump elevating mechanism maybe easily accomplished with a minimum of cost and inconvenience. Conventional dental and like chairs are usually provided with a housing [4 for enclosing the mechanism which normally interconnects the conventional foot pedal with the jack elevating mechanism. In accordance with the present invention, the usual connections in the housing H are removed and the pump and motor mounting, constructed in accordance with the present invention, are'substituted therefor.

The housing I4 has openings 15 and i6 therein at opposite ends thereof and in the present instance, a resilient-member 11, such as a bushing of rubber or like material, is preferably mounted in the opening IS. A casting-i8 having a shank I9 is mounted in the bushing I1, in such a manner that the shoulder 20 on the casting abuts the bushing. A fastening device 2-! is suitably extended through the casting, preferably centrally thereof, and a retaining member 22 is suitably fixed to the inner threaded end 23 of the fastening device. The retaining member 22 has an inwardly directed annular flange 24 adapted to be engaged with the inner edge of the bushing il in such a manner that as the fastening device 2| is tightened, the bushing I1 is compressed between the retaining member and the shoulder 26 of the casting to tightly engage the housing and casting for anchoring the casting in the housing.

An upwardly extending arm 25 is suitably connected with the casting l8 and is provided at its upper end with an aperture for receiving a fastening device 26 which extends therethrough and has ahead 21 engaged with the arm to prevent complete passage of the fastening device 26 through the arm in one direction. A turnbuckle 28 is threadedly mounted on the threaded end 29 of the fastening device 26, the opposite end of the turnbuckle being threadedly mounted on the threaded end 36 of a fastening device 3|, the other end of which fastening device 3| is fixed to a motor housing 32 as indicated at 33.

The motor housing 32 contains a suitable and preferably electric motor which may be enersized through conductors 34, Fig. 1, leading to a source of power, and which may be energized or deenergized by a suitable switch 35. The motor housing 32 is preferably provided on its inner end with a supporting plate 36 having an inwardly directed annular flange 31 within which a sleeved member 38 is mounted and fixed thereto by retaining devices 36 mounted on the flange and engageable with the sleeved mem ber 36.

The sleeved member 38 is reduced at its inner end to provide a collar 46 and internal threads are provided on the collar which are engageable with external threads at one end of a sleeve 4|, 2. set screw 4|) being provided to lock the collar in position on the sleeve 4|. The sleeve 4| has an annular flange 42 at its inner end engageable with the inner edge of a resilient member 43, such as a rubber bushing, which is mounted in the opening |6 of the housing I4 at the end thereof opposite the casting i8.

In order to anchor the bushing 43 and sleeve 4| in the opening i6 of the housing, a lock nut 44 is threadedly mounted on the sleeve 4|, which lock nut has an inwardly extending annular flange 45 engageable with a washer 46 interposed between the lock nut and bushing 43 in such a manner that threading of the, lock nut on the sleeve 4| in the direction of the casting I6, compresses the bushing 43 whereby it tightly engages both the housing i4 and sleeve 4| to securely anchor the sleeve in the housing.

The motor contained within the motor housing 32 has a driving shaft 41 provided with a squared side 46 to receive the mating squared side 46 of the bore 66 in a connecting member 6|, which is sleevable on the driving shaft 41' of the motor. The connecting member ii is provided at one end with aligned apertures for receiving a pin 62 adapted to be extended through a passage 68 in the driven shaft 64 of the Dump 65.

The pump 66 is preferably of gear type and includes a housing, which the numeral Il may designate, and interengageable gears 66 and I1 suitably mounted in close relation within the housing 66 in such a manner that actuation of.

the gear 61 connected with the driven shaft 64 forces pressure medium supplied to the pump housing through the outlet 66 in the housing.

In order'to securely mount the gear pump 66 in the housing i4, the pump housing is provided with a lateral extension 66 engaged about the sleeve 66, which forms a bearing for the driven shaft 64 of the pump. and the lateral extension 66 is threaded and engaged with internal threads at the inner end of the sleeve 4|. In this manner, the pump is anchored within the housing i4 so that the gear 51 thereof and the driven shaft 64 are retained in alignment with the driving shaft 41 of the motor.

The gear pump housing is suitably closed on the motor side thereof and the opposite side of the gear pump housing is closed by a cap member 6| retained in engagement with the pump housing proper by fastening devices 62. .A bearing recess 63 is preferably provided in the cap member 6| for seating the bearing shaft of the gear 56 of the gear pump and an inwardly extending boss 66 on the cap member snugly engages within the inner face 6] of the gear pump to provide a sealing fit between the gear pump housing and cap member 6|. An inlet openin 66 is also provided in the cap member and is preferably positioned therein at a point corresponding to the diverging peripheries of the gears 66 and 51, as indicated at 69 in Fig. 4, in such a manner that as pressure medium is fed to the point 69 of the gear pump housing, such pressure medium is carried outwardly within the teeth of the gears and then inwardly as the perlpheries of the gears converge and approach a completion of one revolution for'compression of the medium to force it through the outlet 56 of the gear pump housing.

In order to supply the gear pump with pressure medium, the inlet 68 in the cap member communicates with a conduit 16 which, through an L connection 1| and the fittings 12; Fig. 3, communicates with the inlet member i3 leading to the sump 4.

The outlet 58 in turn leads through the connection 13 to the air bell i0 and thence to the hydraulic system to elevate the jack.

The operation of an apparatus constructed as described is as follows:

Assuming the pump and motor mounting, constructed in accordance with the-present invention, to be substituted in the housing i4 for the corresponding mechanism of conventional pedally actuated jack elevating mechanisms, and further assuming the jack 2 to be in lowered condition, the motor in the motor housing 32 is energized by actuation of the switch 35. Enersization of the motor rotates thernotor shaft 41 and pump shaft 64 through the connecting member 6| and the gear 5'! in the pump is rotated in a direction opposite that of rotation of the gear 66. Any pressure medium in the pump housing is forced through the outlet 56 and an additional supply of pressure medium is drawn from the sump 4 through the inlet member I3 and its connections through the inlet in the cap member 6| into the gear pump housing in such a manner that the additional supply is also forced out of the outlet 66. From the outlet 66 the pressure medium is transmitted to the connection 16 and the air bell l6 and from the conduit I to the piston chamber 6 and thence to the lifting device 6 for smoothly and efficiently raising the jack 2. Release of the switch 26 governs the desired elevation of the Jack 2.

When it is desired to lower the chair on the Jack 2, the pedal member I2 is actuated for acting on the relief valve II to relieve pressure in the lifting mechanism 6 and return the pressure medium to the sump 4 whereby the jack is lowered under the influence of gravity as in conventional practice.

The principal advantages in an apparatus constructed and operated as described, and particusaid housing in alignment with said pump driven larly the motor driven pump mounting thereof, are that special designs of pedestals are not necessary to convert pedally operated elevating e mechanisms to motor driven elevating mechanisms and economies are thus effected for users.

The elevating mechanism is easily operated and smoothly and efllciently actuated. The motor andpump are'positively mounted on the pedestal in aligned relation and in resilient condition to the end that vibrations and normally hard wear do not adversely affect operation of the apparatus. The mounting is easily assembled and quickly installed, and little or no inconvenience is therefore encountered in changing chairs of this character from pedal to motor driven design.

' What I claim and desire to secure by Letters Patentis:

1. An apparatus of the character described including a support having a housing thereon, a pump having a driven shaft extendingthereirom, a motor having a driving shaft extending therefrom, means on the motor fixing said motor to said housing in alignment with said pump driven shaft, means interconnecting said driving and driven shafts, a casting mounted on said housing, and means mounted on said casting engaged with said motor for aiding in supporting the motor on the housing.

2. An apparatus of the character described including a support having a housing thereon. ex-

tending exteriorly thereof, a pump including a casing having a driven shaft extending therefrom, a motor including a housing having a driving shaft extending therefrom, means on the motor fixing said motor to said housing in alignment with said pump driven shaft, means interconnecting said driving and driven shafts, a casting mounted in said housing at the end thereof opposite the motor, and a turnbuckle mounted on said casting engaged with said motor housing for aiding in supporting the motor on'the housing.

3. An apparatus of the character described inshaft, means interconnecting said driving and driven shafts, a casting mounted on said housing, means mounted on said casting engaged with said motor for aidingin supporting the motor on the housing, and a resilient bushing interposed between the housing and casting in compressed condition for anchoring the casting to. the housing. 7 I

4. An apparatus of the character described ineluding a supporthaving 'a housing thereon, a

pump, a motor, means operatively interconnecting said pump and motor, a castingmounted on saidhousing, means mounted on said casting and engaged with said motor for aiding in supporting the motor on the housing, a resilient bushing interposed between the housing and casting in compressed condition for-anchoring the casting to the housing, and means in the casting engaged with the bushing adapted to effect compression of the bushing. a

5. An apparatus of the character-described ineluding a support having a housing thereon ex;

eluding a support having a housing thereon, a

pump having" a driven shaft extending therefrom, a motor having a driving shaft extending therefrom, means on the motor fixing said motor to tending exteriorly thereof, a pump including a casing having a driven shaft extending therefrom,

a sleeve-engaged with the pump casing and nous ing respectively and extending outwardly relative to the housing, a motor including a housing having a driving shaft extending therefrom, means on the motor, engaged with said sleeve for fixing said motor to said housing in alignment with said pump driven shaft, means interconnecting said driving and driven shafts, a resilient member interposed between said sleeve and housing in compressed condition for anchoring the sleeve to the housing, a casting mounted in said housing at the end thereof opposite the sleeve, a turnbuckle mounted on said casting and engaged with-said motor housing for aiding in supporting the motor on the housing, aresilient member interposed between the housing and casting in compressed condition for anchoring the casting to the housing, 

